[inspection] IDEA-257415 Warnings for value-based classes (Java 16)

This patch adds the inspection to detect usages of value-based classes' instances as monitors in the synchronize statement.

Signed-off-by: Nikita Eshkeev <nikita.eshkeev@jetbrains.com>

GitOrigin-RevId: 178533c1415b2a8f11d48db17c19baa7e6ff4d1a

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/valuebased/ExtendValueBasedClass.java

@@ -0,0 +1,25 @@
+import valuebased.classes.AbstractValueBased;
+
+class AC extends AbstractValueBased {
+  final AC ac = new AC();
+  final Object objectAc = new AC();
+  {
+    final AC localAc = new AC();
+
+    synchronized (<warning descr="Attempt to synchronize on an instance of a value-based class">ac</warning>) {}
+    synchronized (<warning descr="Attempt to synchronize on an instance of a value-based class">objectAc</warning>) {}
+    synchronized (<warning descr="Attempt to synchronize on an instance of a value-based class">localAc</warning>) {}
+    synchronized (AC.class) {}
+
+    f(ac);
+    g(ac);
+  }
+
+  void f(AC ac) {
+    synchronized (<warning descr="Attempt to synchronize on an instance of a value-based class">ac</warning>) {}
+  }
+
+  void g(Object ac) {
+    synchronized (ac) {}
+  }
+}